Method for Fabricating Parts by PIM or MICROPIM

Abstract

“The present invention relates to a method for fabricating parts by an injection molding technique including preparing a feedstock—having at least one powder mixed with a polymer binder solubilized in a solvent, injecting the feedstock into the mold under pressure, debinding, and sintering where the feedstock is maintained at a temperature above a solvent vaporization temperature during the pressing.”

1 . A method for fabricating parts by an injection molding technique comprising:
 preparing a feedstock—comprising at least one powder mixed with a polymer binder solubilized in a solvent;   injecting the feedstock into the mold under pressure;   debinding;   sintering, and   
       wherein the feedstock is maintained at a temperature above a solvent vaporization temperature during the pressing. 
     
     
         2 . The parts fabrication method as claimed in  claim 1 , wherein during evaporation of the solvent, an initial pressure in the mold is maintained. 
     
     
         3 . The parts fabrication method as claimed in  claim 1 , wherein the feedstock contains at least one nanopowder, of which particles are smaller than 100 nm. 
     
     
         4 . The parts fabrication method as claimed in  claim 1 , wherein the solvent is an aqueous solvent. 
     
     
         5 . The parts fabrication method as claimed in  claim 1 , wherein the polymer binder is carboxymethyl cellulose (CMC). 
     
     
         6 . The parts fabrication method as claimed in  claim 1 , wherein the polymer binder is present in a proportion of 3% to 50% of the total volume of the feedstock. 
     
     
         7 . The parts fabrication method as claimed in  claim 1 , wherein the mold is cooled for ejecting the part, before the debinding. 
     
     
         8 . The parts fabrication method as claimed in  claim 1 , wherein a washing is carried out before the sintering.